Evolution of Quasiparticle Charge in the Fractional Quantum Hall Regime

The charge of quasiparticles in a fractional quantum Hall (FQH) liquid, tunneling through a partly reflecting constriction with transmission t, was determined via shot noise measurements. In the ν0ex0ex=0ex0ex1/3 FQH state, a charge smoothly evolving from e*0ex0ex=0ex0exe/3 for t1/31 to e*0ex0ex=0ex0exe for t1/31 was determined, agreeing with chiral Luttinger liquid theory. In the ν0ex0ex=0ex0ex2/5 FQH state the quasiparticle charge evolves smoothly from e*0ex0ex=0ex0exe/5 at t2/51 to a maximum charge less than e*0ex0ex=0ex0exe/3 at t2/51. Thus it appears that quasiparticles with an approximate charge $e/5$ pass a barrier they see as almost opaque.